1 //===-- llvm/Module.h - C++ class to represent a VM module ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// Module.h This file contains the declarations for the Module class.
13 //===----------------------------------------------------------------------===//
18 #include "llvm/Function.h"
19 #include "llvm/GlobalVariable.h"
20 #include "llvm/GlobalAlias.h"
21 #include "llvm/Support/DataTypes.h"
26 class GlobalValueRefMap; // Used by ConstantVals.cpp
29 template<> struct ilist_traits<Function>
30 : public SymbolTableListTraits<Function, Module> {
31 // createSentinel is used to create a node that marks the end of the list.
32 static Function *createSentinel();
33 static void destroySentinel(Function *F) { delete F; }
34 static iplist<Function> &getList(Module *M);
35 static inline ValueSymbolTable *getSymTab(Module *M);
36 static int getListOffset();
38 template<> struct ilist_traits<GlobalVariable>
39 : public SymbolTableListTraits<GlobalVariable, Module> {
40 // createSentinel is used to create a node that marks the end of the list.
41 static GlobalVariable *createSentinel();
42 static void destroySentinel(GlobalVariable *GV) { delete GV; }
43 static iplist<GlobalVariable> &getList(Module *M);
44 static inline ValueSymbolTable *getSymTab(Module *M);
45 static int getListOffset();
47 template<> struct ilist_traits<GlobalAlias>
48 : public SymbolTableListTraits<GlobalAlias, Module> {
49 // createSentinel is used to create a node that marks the end of the list.
50 static GlobalAlias *createSentinel();
51 static void destroySentinel(GlobalAlias *GA) { delete GA; }
52 static iplist<GlobalAlias> &getList(Module *M);
53 static inline ValueSymbolTable *getSymTab(Module *M);
54 static int getListOffset();
57 /// A Module instance is used to store all the information related to an
58 /// LLVM module. Modules are the top level container of all other LLVM
59 /// Intermediate Representation (IR) objects. Each module directly contains a
60 /// list of globals variables, a list of functions, a list of libraries (or
61 /// other modules) this module depends on, a symbol table, and various data
62 /// about the target's characteristics.
64 /// A module maintains a GlobalValRefMap object that is used to hold all
65 /// constant references to global variables in the module. When a global
66 /// variable is destroyed, it should have no entries in the GlobalValueRefMap.
67 /// @brief The main container class for the LLVM Intermediate Representation.
69 /// @name Types And Enumerations
72 /// The type for the list of global variables.
73 typedef iplist<GlobalVariable> GlobalListType;
74 /// The type for the list of functions.
75 typedef iplist<Function> FunctionListType;
76 /// The type for the list of aliases.
77 typedef iplist<GlobalAlias> AliasListType;
79 /// The type for the list of dependent libraries.
80 typedef std::vector<std::string> LibraryListType;
82 /// The Global Variable iterator.
83 typedef GlobalListType::iterator global_iterator;
84 /// The Global Variable constant iterator.
85 typedef GlobalListType::const_iterator const_global_iterator;
87 /// The Function iterators.
88 typedef FunctionListType::iterator iterator;
89 /// The Function constant iterator
90 typedef FunctionListType::const_iterator const_iterator;
92 /// The Global Alias iterators.
93 typedef AliasListType::iterator alias_iterator;
94 /// The Global Alias constant iterator
95 typedef AliasListType::const_iterator const_alias_iterator;
97 /// The Library list iterator.
98 typedef LibraryListType::const_iterator lib_iterator;
100 /// An enumeration for describing the endianess of the target machine.
101 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
103 /// An enumeration for describing the size of a pointer on the target machine.
104 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
107 /// @name Member Variables
110 GlobalListType GlobalList; ///< The Global Variables in the module
111 FunctionListType FunctionList; ///< The Functions in the module
112 AliasListType AliasList; ///< The Aliases in the module
113 LibraryListType LibraryList; ///< The Libraries needed by the module
114 std::string GlobalScopeAsm; ///< Inline Asm at global scope.
115 ValueSymbolTable *ValSymTab; ///< Symbol table for values
116 TypeSymbolTable *TypeSymTab; ///< Symbol table for types
117 std::string ModuleID; ///< Human readable identifier for the module
118 std::string TargetTriple; ///< Platform target triple Module compiled on
119 std::string DataLayout; ///< Target data description
121 friend class Constant;
124 /// @name Constructors
127 /// The Module constructor. Note that there is no default constructor. You
128 /// must provide a name for the module upon construction.
129 explicit Module(const std::string &ModuleID);
130 /// The module destructor. This will dropAllReferences.
134 /// @name Module Level Accessors
137 /// Get the module identifier which is, essentially, the name of the module.
138 /// @returns the module identifier as a string
139 const std::string &getModuleIdentifier() const { return ModuleID; }
141 /// Get the data layout string for the module's target platform. This encodes
142 /// the type sizes and alignments expected by this module.
143 /// @returns the data layout as a string
144 const std::string& getDataLayout() const { return DataLayout; }
146 /// Get the target triple which is a string describing the target host.
147 /// @returns a string containing the target triple.
148 const std::string &getTargetTriple() const { return TargetTriple; }
150 /// Get the target endian information.
151 /// @returns Endianess - an enumeration for the endianess of the target
152 Endianness getEndianness() const;
154 /// Get the target pointer size.
155 /// @returns PointerSize - an enumeration for the size of the target's pointer
156 PointerSize getPointerSize() const;
158 /// Get any module-scope inline assembly blocks.
159 /// @returns a string containing the module-scope inline assembly blocks.
160 const std::string &getModuleInlineAsm() const { return GlobalScopeAsm; }
162 /// @name Module Level Mutators
166 /// Set the module identifier.
167 void setModuleIdentifier(const std::string &ID) { ModuleID = ID; }
169 /// Set the data layout
170 void setDataLayout(const std::string& DL) { DataLayout = DL; }
172 /// Set the target triple.
173 void setTargetTriple(const std::string &T) { TargetTriple = T; }
175 /// Set the module-scope inline assembly blocks.
176 void setModuleInlineAsm(const std::string &Asm) { GlobalScopeAsm = Asm; }
178 /// Append to the module-scope inline assembly blocks, automatically
179 /// appending a newline to the end.
180 void appendModuleInlineAsm(const std::string &Asm) {
181 GlobalScopeAsm += Asm;
182 GlobalScopeAsm += '\n';
186 /// @name Function Accessors
189 /// getOrInsertFunction - Look up the specified function in the module symbol
190 /// table. Four possibilities:
191 /// 1. If it does not exist, add a prototype for the function and return it.
192 /// 2. If it exists, and has a local linkage, the existing function is
193 /// renamed and a new one is inserted.
194 /// 3. Otherwise, if the existing function has the correct prototype, return
195 /// the existing function.
196 /// 4. Finally, the function exists but has the wrong prototype: return the
197 /// function with a constantexpr cast to the right prototype.
198 Constant *getOrInsertFunction(const std::string &Name, const FunctionType *T,
199 AttrListPtr AttributeList);
201 Constant *getOrInsertFunction(const std::string &Name, const FunctionType *T);
203 /// getOrInsertFunction - Look up the specified function in the module symbol
204 /// table. If it does not exist, add a prototype for the function and return
205 /// it. This function guarantees to return a constant of pointer to the
206 /// specified function type or a ConstantExpr BitCast of that type if the
207 /// named function has a different type. This version of the method takes a
208 /// null terminated list of function arguments, which makes it easier for
210 Constant *getOrInsertFunction(const std::string &Name,
211 AttrListPtr AttributeList,
212 const Type *RetTy, ...) END_WITH_NULL;
214 Constant *getOrInsertFunction(const std::string &Name, const Type *RetTy, ...)
217 Constant *getOrInsertTargetIntrinsic(const std::string &Name,
218 const FunctionType *Ty,
219 AttrListPtr AttributeList);
221 /// getFunction - Look up the specified function in the module symbol table.
222 /// If it does not exist, return null.
223 Function *getFunction(const std::string &Name) const;
224 Function *getFunction(const char *Name) const;
227 /// @name Global Variable Accessors
230 /// getGlobalVariable - Look up the specified global variable in the module
231 /// symbol table. If it does not exist, return null. If AllowInternal is set
232 /// to true, this function will return types that have InternalLinkage. By
233 /// default, these types are not returned.
234 GlobalVariable *getGlobalVariable(const std::string &Name,
235 bool AllowInternal = false) const;
237 /// getNamedGlobal - Return the first global variable in the module with the
238 /// specified name, of arbitrary type. This method returns null if a global
239 /// with the specified name is not found.
240 GlobalVariable *getNamedGlobal(const std::string &Name) const {
241 return getGlobalVariable(Name, true);
244 /// getOrInsertGlobal - Look up the specified global in the module symbol
246 /// 1. If it does not exist, add a declaration of the global and return it.
247 /// 2. Else, the global exists but has the wrong type: return the function
248 /// with a constantexpr cast to the right type.
249 /// 3. Finally, if the existing global is the correct delclaration, return
250 /// the existing global.
251 Constant *getOrInsertGlobal(const std::string &Name, const Type *Ty);
254 /// @name Global Alias Accessors
257 /// getNamedAlias - Return the first global alias in the module with the
258 /// specified name, of arbitrary type. This method returns null if a global
259 /// with the specified name is not found.
260 GlobalAlias *getNamedAlias(const std::string &Name) const;
263 /// @name Type Accessors
266 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
267 /// there is already an entry for this name, true is returned and the symbol
268 /// table is not modified.
269 bool addTypeName(const std::string &Name, const Type *Ty);
271 /// getTypeName - If there is at least one entry in the symbol table for the
272 /// specified type, return it.
273 std::string getTypeName(const Type *Ty) const;
275 /// getTypeByName - Return the type with the specified name in this module, or
276 /// null if there is none by that name.
277 const Type *getTypeByName(const std::string &Name) const;
280 /// @name Direct access to the globals list, functions list, and symbol table
283 /// Get the Module's list of global variables (constant).
284 const GlobalListType &getGlobalList() const { return GlobalList; }
285 /// Get the Module's list of global variables.
286 GlobalListType &getGlobalList() { return GlobalList; }
287 /// Get the Module's list of functions (constant).
288 const FunctionListType &getFunctionList() const { return FunctionList; }
289 /// Get the Module's list of functions.
290 FunctionListType &getFunctionList() { return FunctionList; }
291 /// Get the Module's list of aliases (constant).
292 const AliasListType &getAliasList() const { return AliasList; }
293 /// Get the Module's list of aliases.
294 AliasListType &getAliasList() { return AliasList; }
295 /// Get the symbol table of global variable and function identifiers
296 const ValueSymbolTable &getValueSymbolTable() const { return *ValSymTab; }
297 /// Get the Module's symbol table of global variable and function identifiers.
298 ValueSymbolTable &getValueSymbolTable() { return *ValSymTab; }
299 /// Get the symbol table of types
300 const TypeSymbolTable &getTypeSymbolTable() const { return *TypeSymTab; }
301 /// Get the Module's symbol table of types
302 TypeSymbolTable &getTypeSymbolTable() { return *TypeSymTab; }
305 /// @name Global Variable Iteration
308 /// Get an iterator to the first global variable
309 global_iterator global_begin() { return GlobalList.begin(); }
310 /// Get a constant iterator to the first global variable
311 const_global_iterator global_begin() const { return GlobalList.begin(); }
312 /// Get an iterator to the last global variable
313 global_iterator global_end () { return GlobalList.end(); }
314 /// Get a constant iterator to the last global variable
315 const_global_iterator global_end () const { return GlobalList.end(); }
316 /// Determine if the list of globals is empty.
317 bool global_empty() const { return GlobalList.empty(); }
320 /// @name Function Iteration
323 /// Get an iterator to the first function.
324 iterator begin() { return FunctionList.begin(); }
325 /// Get a constant iterator to the first function.
326 const_iterator begin() const { return FunctionList.begin(); }
327 /// Get an iterator to the last function.
328 iterator end () { return FunctionList.end(); }
329 /// Get a constant iterator to the last function.
330 const_iterator end () const { return FunctionList.end(); }
331 /// Determine how many functions are in the Module's list of functions.
332 size_t size() const { return FunctionList.size(); }
333 /// Determine if the list of functions is empty.
334 bool empty() const { return FunctionList.empty(); }
337 /// @name Dependent Library Iteration
340 /// @brief Get a constant iterator to beginning of dependent library list.
341 inline lib_iterator lib_begin() const { return LibraryList.begin(); }
342 /// @brief Get a constant iterator to end of dependent library list.
343 inline lib_iterator lib_end() const { return LibraryList.end(); }
344 /// @brief Returns the number of items in the list of libraries.
345 inline size_t lib_size() const { return LibraryList.size(); }
346 /// @brief Add a library to the list of dependent libraries
347 void addLibrary(const std::string& Lib);
348 /// @brief Remove a library from the list of dependent libraries
349 void removeLibrary(const std::string& Lib);
350 /// @brief Get all the libraries
351 inline const LibraryListType& getLibraries() const { return LibraryList; }
354 /// @name Alias Iteration
357 /// Get an iterator to the first alias.
358 alias_iterator alias_begin() { return AliasList.begin(); }
359 /// Get a constant iterator to the first alias.
360 const_alias_iterator alias_begin() const { return AliasList.begin(); }
361 /// Get an iterator to the last alias.
362 alias_iterator alias_end () { return AliasList.end(); }
363 /// Get a constant iterator to the last alias.
364 const_alias_iterator alias_end () const { return AliasList.end(); }
365 /// Determine how many functions are in the Module's list of aliases.
366 size_t alias_size () const { return AliasList.size(); }
367 /// Determine if the list of aliases is empty.
368 bool alias_empty() const { return AliasList.empty(); }
371 /// @name Utility functions for printing and dumping Module objects
374 /// Print the module to an output stream with AssemblyAnnotationWriter.
375 void print(raw_ostream &OS, AssemblyAnnotationWriter *AAW) const;
376 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
378 /// Dump the module to stderr (for debugging).
380 /// This function causes all the subinstructions to "let go" of all references
381 /// that they are maintaining. This allows one to 'delete' a whole class at
382 /// a time, even though there may be circular references... first all
383 /// references are dropped, and all use counts go to zero. Then everything
384 /// is delete'd for real. Note that no operations are valid on an object
385 /// that has "dropped all references", except operator delete.
386 void dropAllReferences();
389 static unsigned getFunctionListOffset() {
391 return unsigned(reinterpret_cast<uintptr_t>(&Obj->FunctionList));
393 static unsigned getGlobalVariableListOffset() {
395 return unsigned(reinterpret_cast<uintptr_t>(&Obj->GlobalList));
397 static unsigned getAliasListOffset() {
399 return unsigned(reinterpret_cast<uintptr_t>(&Obj->AliasList));
403 /// An iostream inserter for modules.
404 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
408 inline raw_ostream &operator<<(raw_ostream &O, const Module &M) {
414 inline ValueSymbolTable *
415 ilist_traits<Function>::getSymTab(Module *M) {
416 return M ? &M->getValueSymbolTable() : 0;
419 inline ValueSymbolTable *
420 ilist_traits<GlobalVariable>::getSymTab(Module *M) {
421 return M ? &M->getValueSymbolTable() : 0;
424 inline ValueSymbolTable *
425 ilist_traits<GlobalAlias>::getSymTab(Module *M) {
426 return M ? &M->getValueSymbolTable() : 0;
430 ilist_traits<Function>::getListOffset() {
431 return Module::getFunctionListOffset();
435 ilist_traits<GlobalVariable>::getListOffset() {
436 return Module::getGlobalVariableListOffset();
440 ilist_traits<GlobalAlias>::getListOffset() {
441 return Module::getAliasListOffset();
444 } // End llvm namespace